I was reading the synopsis and keyed in on something in this part :
This is more of a theory than a spoiler, but it pertains specifically to this episode...
Okay, so we know that Peter Pan was able to fly back and forth between our world and Neverland (assuming Wendy is, in fact, from our world). So, perhaps Captain Hook could sail (or fly his ship
) to our world, but he would need the magical compass to find the way.
That brings up the question of why the Blue Fairy told Rumple there was no other way to follow Bae, but I don't think she is all-knowing, so perhaps she didn't know about Peter or his trips to Wendy's window.